package com.example.springboot.utils;

import lombok.extern.slf4j.Slf4j;
import org.lionsoul.ip2region.*;
import org.lionsoul.ip2region.xdb.Searcher;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * @Author:ChenZhangKun
 * @Date: 2021/7/29 11:05
 */
@Slf4j
public class IpUtil {
    public static String getIpAddr(HttpServletRequest request) {
        String ipAddress = null;
        try {
            ipAddress = request.getHeader("x-forwarded-for");
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("WL-Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getRemoteAddr();
                if (ipAddress.equals("127.0.0.1")) {
                    // 根据网卡取本机配置的IP
                    InetAddress inet = null;
                    try {
                        inet = InetAddress.getLocalHost();
                    } catch (UnknownHostException e) {
                        e.printStackTrace();
                    }
                    ipAddress = inet.getHostAddress();
                }
            }
            // 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
            if (ipAddress != null && ipAddress.length() > 15) { // "***.***.***.***".length()
                // = 15
                if (ipAddress.indexOf(",") > 0) {
                    ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
                }
            }
        } catch (Exception e) {
            ipAddress = "";
        }
        // ipAddress = this.getRequest().getRemoteAddr();

        return ipAddress;
    }

/*    *//**
     * @param ip
     * @return
     *//*
    public static String getAddress(String ip) throws DbMakerConfigException, IOException {
        return getAddress(ip, DbSearcher.BTREE_ALGORITHM);
    }

    *//**
     * @param ip        IP地址
     * @param algorithm 算法
     * @return
     *//*
    public static String getAddress(String ip, int algorithm) throws DbMakerConfigException, IOException {
        if (!Util.isIpAddress(ip)) {
            log.error("错误的ip格式{}", ip);
            return "";
        }
        String path = IpUtil.class.getResource("/db/ip2region.db").getPath();
        File file = new File(path);
        if (!file.exists()) {
            log.error("地址库文件不存在");
            return "";
        }
        DbSearcher dbSearcher = new DbSearcher(new DbConfig(), path);
        DataBlock dataBlock;
        switch (algorithm) {
            case DbSearcher.BTREE_ALGORITHM:
                dataBlock = dbSearcher.btreeSearch(ip);
                break;
            case DbSearcher.BINARY_ALGORITHM:
                dataBlock = dbSearcher.binarySearch(ip);
                break;
            case DbSearcher.MEMORY_ALGORITYM:
                dataBlock = dbSearcher.memorySearch(ip);
                break;
            default:
                log.error("未传入正确的查询算法");
                return "";
        }
        dbSearcher.close();
        return dataBlock.getRegion();
    }*/
}
